Our Direct Fired Heater Product Line

Sigma Thermal direct fired heaters are constructed to use radiant and/or convection heat transfer sections. Our heaters can be arranged in various ways to meet your process requirements. The flexibility of the design allows for any style of furnace burner to be utilized in single or multi-burner configurations.

What type of direct fired heater systems does Sigma Thermal offer?

This is the most commonly used style of direct fired heater for heavy industrial uses. These heaters utilize a bare tube radiant zone in combination with a bare or finned convection section. They can be utilized with thermal fluids, viscous hydrocarbons, suspended solids or gas mixtures. They can also exceed 90% base efficiency and operated fully automatically.

Sigma Thermal’s convection style direct fired heater utilizes a separate combustion chamber and flue gas recirculation to reduce combustion chamber temperatures to minimize the impact of radiant heat transfer to the process coil. It can be utilized with hydrocarbons, suspended solids, thermal fluids, or a mixture of gases. Paired with an optional economizer, the base efficiency of this design can reach 93%.